Methane is the second most important greenhouse gas after carbon dioxide, and the reduction of methane emissions is a key focus in IPCC reports. At present, atmospheric methane is monitored through ground-based observations and satellite remote sensing that depend on spectral characteristics. However, the positions of the methane lines provided by the widely utilized HITRAN database lack the precision required for accurate retrievals. In this work, we used cavity-enhanced absorption spectroscopy to record the absorption spectrum near the atmospheric detection window of methane at 1.66 µm. From the saturated absorption peaks (“Lamb dips”) observed on top of Doppler-broadened methane absorption lines, we determined the line positions with an absolute frequency accuracy of better than 2 MHz. The results also indicate the incompetence of the HITRAN database and theoretical models based on αb initio calculations of methane lines in this region.
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December 2024
Research Article|
December 01 2024
Saturated absorption spectroscopy of methane around 1667 nm†
Yuan Ding;
Yuan Ding
a
State Key Laboratory of Molecular Reaction Dynamics, Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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Fanghui Cao;
Fanghui Cao
b
Hefei National Research Center of Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
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Jinke Li;
Jinke Li
a
State Key Laboratory of Molecular Reaction Dynamics, Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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Jin Wang;
Jin Wang
b
Hefei National Research Center of Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
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Anwen Liu;
Anwen Liu
a
State Key Laboratory of Molecular Reaction Dynamics, Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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Yan Tan;
Yan Tan
*
b
Hefei National Research Center of Physical Sciences at the Microscale, University of Science and Technology of China
, Hefei 230026, China
*Author to whom correspondence should be addressed. E-mail: [email protected]
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Shuiming Hu
Shuiming Hu
a
State Key Laboratory of Molecular Reaction Dynamics, Department of Chemical Physics, University of Science and Technology of China
, Hefei 230026, China
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*Author to whom correspondence should be addressed. E-mail: [email protected]
†
Part of Special Issue “In Memory of Prof. Xingxiao Ma on the occasion of his 90th Anniversary”.
Chin. J. Chem. Phys. 37, 721–728 (2024)
Article history
Received:
July 10 2024
Accepted:
September 18 2024
Citation
Yuan Ding, Fanghui Cao, Jinke Li, Jin Wang, Anwen Liu, Yan Tan, Shuiming Hu; Saturated absorption spectroscopy of methane around 1667 nm. Chin. J. Chem. Phys. 1 December 2024; 37 (6): 721–728. https://doi.org/10.1063/1674-0068/cjcp2407090
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